West Branch Susquehanna River at Lewisburg, Northumberland County PA (LWBP1)
Gage Location: Northumberland County, Pennsylvania Site Location: Union County, Pennsylvania
Latitude: 40.968Longitude: -76.876Elevation: 428.2 ft. MSLDrainage Area: 6847 Sq. Mi.
Minor Stage: 18 ft. Moderate Stage: 23 ft.Major Stage: 28 ft.
First Flood: 1865-03-17Last Flood: 2011-09-08 Crest: 25.75 ft.Datum change: 1940-07-02Number of Floods: 39

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1865-03-1726.5-9999ModerateC1
1889-06-0129.8-9999MajorC1
1894-05-2128.5-9999MajorC1
1902-03-0122.3-9999MinorC1
1909-05-0119.5-9999MinorC1
1936-03-1932.1287000MajorC1 F1
1940-04-0122.7164000MinorC1
1942-05-2318.57117000Minornone
1942-12-3122.47151000Minornone
1946-05-2928.43262000Majornone
1948-04-1520.07132000Minornone
1950-03-3018.15107000Minornone
1950-11-2626.05216000Moderatenone
1952-03-1218.08112000Minornone
1954-03-0318.51118000Minornone
1956-03-0919.8121000Minornone
1956-11-0318.6118000Minornone
1959-01-2318.22115000Minornone
1960-04-0121134000Minornone
1961-02-2721.17139000Minornone
1964-03-1126.16210000ModerateC5
1972-06-2434.23300000MajorC5 F2
1975-09-2727.62242000ModerateF2
1979-03-0623.44165000ModerateC5 F2
1981-02-2418.83123000MinorC5 F2
1982-02-0319.82-9999MinorC5 F2
1984-02-1524.26192000ModerateC5 F2
1986-03-1518.61112000MinorC5 F2
1993-04-0221.33146000MinorF2
1994-03-2618.28111000MinorF2
1996-01-2025.94205000ModerateF2
1998-01-0918.83118000MinorF2
2004-09-1926.01209000ModerateC5 F2
2005-04-0318.79113000MinorF2
2010-01-2619.03118000MinorF2
2010-12-0220.9142000MinorF2
2011-03-1120.78122000MinorF2
2011-04-2920.1113000MinorF2
2011-09-0825.75168000ModerateF2



Codes and description

C1|Crest information during this period may be incomplete and therefore was not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information during this period looks reliable despite potential problems. This data was used in frequency calculations.
C3|Crest height estimated by the USGS.
C4|Crest height is from the National Weather Service.
C5|Crest height affected by backwater.
C6|Crest occurred at a previous flood stage that is lower than the current flood stage. The crests below the new flood stage are not used in flood frequency calculations.
C7|Crest from USGS yearly peak and/or date is different than the crest we provide. In many cases MARFC uses crest based on backwater or ice effects.
C8|Crest month or day of occurrence has been estimated by The Middle Atlantic River Forecast Center usually based on nearby gage information.
C9|Crest date (day) in the month is unknown.
F1|Flow is an estimate.
F2|Flow affected by regulation or diversion and in some cases to an unknown degree.
F3|Flow effected by snow-melt, ice jam or debris jam break up.
F4|Flow affected by dam failure.
F5|Flow - All or part of the record affected by urbanization, mining, agricultural changes, channelization or other factors.
G1|Gage height at a different site and/or datum.
G2|Gage is not an official USGS gage with crests provided by the NWS. Crest information looks unreliable and incomplete and not used in flood frequency calculations.
G3|Gage datum changed during this year.
none,No code; Good Data

Updated: 07:31 AM Dec 19, 2014